Researchers have described the sixth mass extinction, or the Anthropocene extinction, as the “most serious environmental problem”

  • What is the mass extinction of species?

  • What are the implications of this mass extinction?

  • What is the sixth mass extinction?

  • Why it is attributable to humans?

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What is the context about?

The ongoing sixth mass extinction may be one of the most serious environmental threats to the persistence of civilisation, according to new research. The research was published in the journal Proceedings of the National Academy of Sciences of the United States of America (PNAS).

What is the mass extinction of species?

  • Mass extinction refers to a substantial increase in the degree of extinction or when the Earth loses more than three-quarters of its species in a geologically short period of time.
  • So far, during the entire history of the Earth, there have been five mass extinctions.

What are the implications of this mass extinction?

  • The five mass extinctions that took place in the last 450 million years have led to the destruction of 70-95 per cent of the species of plants, animals and microorganisms that existed earlier.
  • These extinctions were caused by “catastrophic alterations” to the environment, such as massive volcanic eruptions, depletion of oceanic oxygen or collision with an asteroid.
  • After each of these extinctions, it took millions of years to regain species comparable to those that existed before the event.

What is the sixth mass extinction?

  • The sixth, which is ongoing, is referred to as the Anthropocene extinction.
  • Researchers have described it as the “most serious environmental problem” since the loss of species will be permanent.

Why it is attributable to humans?

  • One of the reasons that humanity is an “unprecedented threat” to many living organisms is because of their growing numbers.
  • The loss of species has been occurring since human ancestors developed agriculture over 11,000 years ago. Since then, the human population has increased from about 1 million to 7.7 billion.

Changes occurred and occurring:

  • More than 400 vertebrate species went extinct in the last century, extinctions that would have taken over 10,000 years in the normal course of evolution.
  • In a sample of 177 species of large mammals, most lost more than 80 per cent of their geographic range in the last 100 years, and 32 per cent of over 27,000 vertebrate species have declining populations.
  • Many of the species currently endangered or on the brink of extinction are being decimated by legal and illegal wildlife trade.
  • Several species of mammals that were relatively safe one or two decades ago are now endangered, including cheetahs, lions and giraffes. There are as few as 20,000 lions left in the wild, less than 7,000 cheetahs, 500 to 1,000 giant pandas, and about 250 Sumatran rhinoceros.

What happens when species go extinct?

  • Impact can be tangible such as in the form of a loss in crop pollination and water purification.
  • If a species has a specific function in an ecosystem, the loss can lead to consequences for other species by impacting the food chain.
  • Effects of extinction will worsen in the coming decades as the resulting genetic and cultural variability will change entire ecosystems.
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